JP2002289438A - Coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil component having no risk of the occurrence of insulation destruction or disconnection of a winding in the corners of a through hole on a magnetic substance core, with which the insulating coating of the magnetic substance core can be made thin with harmonized characteristics advantageous in the aspect of safety. SOLUTION: The coil component is provided with the magnetic substance core 1, the winding 9 and a core case 3 holding the magnetic substance core 1 and having a terminal 6 for connecting a winding wire terminal. The magnetic substance core 1 has at least two through holes 2 linearly provided from one end face to the other end face. The core case 3 has through holes 7 and 8 as many as through holes 2, which are provided on the magnetic substance core 1, on a case top plate 3a and a case bottom plate 3b, respectively, and at least one of side faces of the core case has an opening part 5a. The magnetic substance core 1 is fixed inside the core case 3. The winding 9 is wound through the through hole 2 on the magnetic substance core 1 and the through hole 8 on the case bottom plate part onto the core case 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil component for forming a transformer or an inductor by forming a through-hole in a magnetic core and inserting and winding a winding through the through-hole.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view showing an example of this type of coil component. Reference numeral 31 denotes a magnetic core made of a material having a high magnetic permeability such as ferrite. The magnetic core 31 has two or more through holes 32 extending from one end face to the other end face (in this example, six through holes 32).
Have). The winding 33 is inserted into and wound around two pairs of through holes 32. Reference numeral 34 denotes a resin terminal block to which the terminals 35 are fixed. The magnetic core 31 on which the windings 33 are wound is fixed to the terminal base 34 by bonding, and the terminals 33 a of the respective windings 33 are entangled with the terminals 35. Connected.

[0003]

This type of coil component has the advantages of low magnetic flux leakage and high efficiency.
However, the winding 33 is formed by the through hole 32 of the magnetic core 31.
Is in contact with the corners of the ends of the windings 33, so that the insulating coating of the windings 33 is peeled off, and there is a risk of electrical conduction or disconnection between the windings or between the windings and the magnetic core 31. was there.

In the case of using a Mn-Zn ferrite as the magnetic material core, a fluorine coating or a para-xylene coating is applied because of its low electric resistance. However, in order to prevent coating destruction due to contact with the winding, The thickness of the coating is increased, and this causes a problem that the inductance is changed by the stress generated by the contraction of the coating agent, and the variation of the inductance is increased.

Further, due to external shock, vibration, etc.,
In the worst case, there was a concern about safety, for example, the magnetic core 1 was broken and dropped or scattered.

SUMMARY OF THE INVENTION In view of the above problems, the present invention does not cause a dielectric breakdown or disconnection at the corners of the through holes of the magnetic core, and the magnetic core has a thin insulating coating and uniform characteristics. It is another object of the present invention to provide a coil component that is advantageous in terms of safety.

[0007]

According to a first aspect of the present invention, there is provided a coil component comprising a magnetic core, a winding, and a core case holding the magnetic core and having a terminal to which the winding terminal is connected. Wherein the magnetic core has two or more through holes linearly provided from one end face to the other end face thereof, and the core case has the through holes of the magnetic core. And the same number of through holes in the case top plate and the case bottom plate, respectively, and at least one of the side surfaces of the core case is open, and the magnetic core is inserted through the opening in the side surface of the core case. In the fixed state, the positions of the through holes provided in the case top plate portion and the case bottom plate portion of the core case in the through holes of the magnetic core correspond to the positions of the through holes provided in the case top plate. Part Hole, the through hole of the magnetic core, characterized in that it is wound on the core case through the through hole of the case bottom plate portion.

Thus, the case top plate of the core case,
By applying a winding to the outside of the core case through a winding through the through hole provided in the magnetic core and the case bottom plate, the winding is more flexible than the magnetic core without contacting at the corners of the magnetic core. Since the contact portion is bent at the corner of the through hole of the resin core case, the insulating coating of the winding can be prevented from peeling off.

In addition, since the winding does not contact the corner of the through hole of the magnetic core, the thickness of the insulating coating on the magnetic core can be reduced or eliminated, and the decrease in inductance due to shrinkage of the insulating coating is reduced. Or you can eliminate it.

[0010] Further, since the magnetic core is held in the core case, external impact is reduced, cracks due to damage are prevented, and scattering of the magnetic core is prevented. improves.

According to a second aspect of the present invention, there is provided a coil component comprising: a magnetic core;
A coil component comprising a winding, a core case for holding the magnetic core, and a terminal block having a terminal to which the winding end is connected, wherein the magnetic core extends from one end face to the other end. The core case has the same number of through holes as the through holes of the magnetic core in the case top plate portion and the case bottom plate portion, respectively. At least one of the side surfaces of the core case is open, and the magnetic core is inserted and fixed through an opening of the side surface of the core case. In the fixed state, the core is inserted into a through hole of the magnetic core. The windings are aligned with the positions of the through holes provided in the case top plate and the case bottom plate of the case, and the winding is formed in the case top plate, the magnetic material core through hole, and the case bottom plate. Through the hole before Wound on the core case, core case which has been subjected to the winding, characterized in that the winding terminal is fixed to the terminal block is connected to the terminal.

Also in the structure of the second aspect, for the same reason as in the first aspect, winding insulation breakdown is avoided, and the decrease in inductance due to the insulating coating of the magnetic core is reduced or eliminated, and safety is improved.

According to a third aspect of the present invention, in the first or second aspect, the through holes provided in the case top plate and the case bottom plate of the core case are formed smaller than the through holes of the magnetic core. It is characterized by the following.

As described above, by making the through holes in the case top plate and the case bottom plate smaller than the through holes of the magnetic core, contact of the winding with the corners of the through holes of the magnetic core is completely prevented. be able to.

According to a fourth aspect of the present invention, there is provided a coil component.
In any of the above, a cover for covering the top plate side of the core case is provided.

In this manner, by covering the top plate side of the core case with the cover, the winding exposed on the upper surface of the core case is protected by the cover. Further, the cover can be used as a suction surface by the mounter.

[0017]

FIG. 1A is a perspective view showing an embodiment of a coil component according to the present invention before assembling, and FIG.
FIG. 2B is a perspective view showing a state where the magnetic core is combined with a core case, and FIG. 2A is a perspective view showing a completed product.

In these figures, reference numeral 1 denotes a magnetic core made of a material having high magnetic permeability such as ferrite. Reference numeral 2 denotes a through hole provided from one end face to the other end face of the magnetic core 1, and in this embodiment, six through holes 2 are provided.

Reference numeral 3 denotes a core case made of resin. The core case 3 has a box-shaped core holding portion 4 for tightly fitting the magnetic core 1 therein. Having an opening 5. On both sides of the core holding part 4, terminals 6 of a surface mounting type structure are fixed.

The core case 3 is provided with the same number of through holes 7 and 8 as the through holes 2 of the magnetic core 1.
a and the case bottom plate 3b. FIG.
As shown in (B), the diameter D1 of the through hole 7 of the case top plate 3a of the core case 3 (the same applies to the through hole 8 of the case bottom plate 3b) from the diameter D2 of the through hole 2 of the magnetic core 1. Is preferably formed small.

The magnetic core 1 is inserted into the core holder 4 of the core case 3 through the opening 5 on the side surface, and the tip of the magnetic core 1 is positioned at the end face of the core case 3, that is, on the side opposite to the opening 5. It is positioned by contacting the surface. In this positioning state, the magnetic core 1 is fixed to the core case 3 by bonding or the like. In this fixed state, the positions of the through holes 7, 8 provided in the case top plate 3a and the case bottom plate 3b of the core case 3 coincide with the through holes 2 of the magnetic core 1.

In the state where the magnetic core 1 is held and fixed in the core case 3 as described above, the winding 9 is connected to the through hole 7 of the case top plate 3a, the through hole 2 of the magnetic core 1,
The core case 3 is passed through the through hole 8 of the case bottom plate 3b.
Wrap around. Then, the terminal of the winding 9 is tied to the terminal 6 and soldered. This winding 9 may be connected to the terminal 6 by welding.

Reference numeral 10 denotes a resin cover.
Consists of a top plate portion 10a, both side plate portions 10b, and locking pieces 10c formed by bending inward from the lower ends of the both side plate portions 10b. As shown in FIG. 3, the cover 10 covers the case top plate portion 3a of the core case 3 with the top plate portion 10a of the cover 10, and has the side plate portion 10b on the side opposite to the opening 5 of the core case 3 attached thereto. The side surface is covered, and the locking piece 10c is locked and attached to the lower surface of the case bottom plate 3b. In this case, the top plate portion 10a of the cover 10 is supported by the protrusion 13 provided on the upper surface of the core case 3, so that the top plate portion 10a is pressed against the winding 9 so that no excessive force is applied to the winding 9. .

As described above, the winding 9 is passed through the through holes 7, 2, and 8 provided in the case top plate 3a, the magnetic core 1, and the case bottom plate 3b of the core case 3, respectively.
The winding 9 is provided outside the magnetic core 1.
Without contact at the corners of the through-holes 2, but at the corners of the through-holes 7, 8 of the resin core case 3, which is more flexible than the magnetic core 1. Can be spared.

In this case, as shown in FIG. 2B, the through holes 7 in the case top plate 3a and the case bottom plate 3b
By making the size 8 smaller than the through hole 2 of the magnetic core 1, it is possible to more reliably prevent the winding 9 from coming into contact with the corner of the through hole 2, and to remove the clothing.
Can be more reliably avoided.
Further, as shown in FIG. 2B, the through holes 7 (same for 8)
Is formed in an R-shape so that the winding 9
Of the insulating film is more reliably prevented.

If the winding 9 does not contact the corners of the through hole 2 of the magnetic core 1 as described above, the thickness of the insulating coating (fluorine coating or paraffin coating) on the magnetic core 1 must be reduced. Or can be lost,
The decrease in inductance due to contraction of the insulating coating can be reduced or eliminated.

Further, since the magnetic core 1 is held in the core case 3, external impact is reduced, cracks due to breakage are prevented, and scattering of the magnetic core 1 is prevented. Safety is improved.

Further, by covering the top plate 3 a and both side surfaces of the core case 3 with the cover 10, the winding 9 exposed on the upper surface of the core case 3 is protected by the cover 10. Further, the cover 10 can be used as a suction surface by the mounter.

FIGS. 3A and 3B are perspective views showing another embodiment of the present invention. In this embodiment, the through hole 2 of the magnetic core 1 and the case top of the core case 3 are shown. Two through holes 7 are formed in the plate portion 3a and two through holes 8 are formed in the case bottom plate portion 3b, and three windings 9 are wound through these through holes in common.

FIGS. 4A, 4B, and 4C are perspective views showing another embodiment of the coil component according to the present invention in which the shape of the terminal is changed. The example of FIG. 4A is a surface mount type coil component in which a step 14 is provided in a part of the terminal 6A. FIG. 4B shows a surface-mounted terminal 6B in which the lower part of the terminal is bent inward. In the example of FIG. 4C, a straight type terminal 6C is inserted into a through hole of a printed circuit board.

FIG. 5 shows another embodiment of the coil component according to the present invention, in which a core case 11 and a terminal block 12 to which the terminals 6 are fixed are formed separately. In this embodiment, a core case 1 having a box shape with a single-sided opening is provided.
The same number of through holes 7 and 8 as the number of through holes 2 of the magnetic core 1 are provided in the top plate portion 11a and the bottom plate portion 11b in the same manner as described above. Then, the magnetic core 1 is housed and fixed in the core case 11 in the same manner as described above, and after the winding 9 is applied, the magnetic core 1 is fitted and fixed to the core case housing portion 12 a provided on the terminal block 12. And glue. Then, the winding terminal 9a is tied and soldered or welded to the terminal 6 fixed to the terminal block 12.

In practicing the present invention, the core case 3
The core holding portion 4 and the core case 11 may have a double-sided opening structure if a stopper or the like for positioning the magnetic core 1 is provided.

[0033]

According to the first and second aspects of the present invention, a structure is provided in which windings are passed through the through holes provided in the case top plate, the magnetic core, and the case bottom plate of the core case, and the windings are wound outside the core case. Since the winding does not come into contact with the corners of the magnetic core, the winding is contacted and bent at the corners of the through-hole of the resin core case, which is more flexible than the magnetic core. Can be spared.

Further, since the winding does not contact the corner of the through hole of the magnetic core, the thickness of the insulating coating of the magnetic core can be reduced or eliminated, and the decrease in inductance due to shrinkage of the insulating coating is reduced. Or can be lost,
Variations in characteristics can be reduced.

Also, since the magnetic core is held in the core case, external impact is reduced, cracks due to breakage are prevented, and scattering of the magnetic core is prevented. improves.

According to the third aspect, the through holes provided in the case top plate and the case bottom plate of the core case are formed smaller than the through holes of the magnetic core. The contact of the winding can be completely prevented.

According to the fourth aspect, since the top plate side of the core case is covered with the cover, the windings exposed on the upper surface of the core case are protected by the cover. Further, the cover can be used as a suction surface by the mounter.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a state before assembling a coil component according to an embodiment of the present invention, and FIG. 1B is a perspective view showing a state where the magnetic core is combined with a core case.

2A is a perspective view showing a completed product of the coil component of FIG. 1, and FIG. 2B is a partially enlarged sectional view thereof.

FIG. 3 (A) is a perspective view showing a state before assembling another embodiment of the coil component of the present invention, and FIG. 3 (B) is a perspective view showing a state where the magnetic core is combined with a core case. .

FIGS. 4A, 4B, and 4C are perspective views showing another embodiment of the coil component of the present invention.

FIG. 5 is an exploded perspective view showing another embodiment of the coil component of the present invention.

FIG. 6 is a perspective view showing a conventional coil component.

[Explanation of symbols]

1: magnetic core, 2, through hole, 3: core case, 3a:
Case top plate part, 3b: Case bottom plate part, 4: Core holding part,
5: Opening, 6, 6A to 6C: Terminal, 7, 8: Through hole,
9: winding, 10: cover, 11: core case, 11a:
Case top plate, 11b: Case bottom plate, 12: Terminal block,
12a: core case housing, 13: protrusion

Continuation of the front page (72) Inventor Takashi Kase 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation F term (reference) 5E044 CA09 CB08 DA06 5E070 AA01 AB01 BA03 DA03 DB01 DB06 EB01

Claims (4)

[Claims] 1. A coil component comprising: a magnetic core, a winding, and a core case holding the magnetic core and having a terminal to which the winding terminal is connected, wherein the magnetic core is Has two or more through-holes linearly provided from one end face to the other end face thereof, and the core case has the same number of through-holes as the through-holes of the magnetic core and a case top plate portion and a case. At least one of the side surfaces of the core case is provided in the bottom plate portion, and at least one of the side surfaces of the core case is opened. The magnetic material core is inserted and fixed through an opening of the side surface of the core case, and the magnetic material in the fixed state The positions of the through holes provided in the case top plate and the case bottom plate of the core case correspond to the positions of the through holes in the core case, and the winding is formed in the case top plate and the magnetic core. , The case A coil component wound around the core case through a through hole in a bottom plate portion. 2. A coil component comprising a magnetic core, a winding, a core case for holding the magnetic core, and a terminal block having a terminal to which the winding end is connected. The magnetic core has two or more through holes linearly provided from one end face to the other end face thereof, and the core case has the same number of through holes as the magnetic core has in the case top plate. And at least one of the side surfaces of the core case is opened, and the magnetic core is inserted and fixed through the opening of the side surface of the core case, and in the fixed state. The positions of the through holes provided in the case top plate portion and the case bottom plate portion of the core case in the through holes of the magnetic core correspond to the positions of the through holes in the case top plate portion and the magnetic core. Through holes, A coil wound around the core case through a through hole in the base plate, the core case having the winding applied thereto is fixed to the terminal block, and a winding terminal is connected to the terminal. parts. 3. The coil component according to claim 1, wherein the through holes provided in the case top plate and the case bottom plate of the core case are formed smaller than the through holes of the magnetic core. And coil components. 4. The coil component according to claim 1, further comprising a cover that covers a top plate side of the core case.